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Can we use both 2NC and 1NO block together on the light block ZB6ZB**B .

You can not mount both 2NC and 1NO block together on this ZB6ZB**B (fixing collar + contact block + LED) , as you can mount maximum 2 contact block for example 2 NC or 2 NO or (1 NO & 1NC ) contact block with a LED ZB6ZB**B